Contributions to the anatomy of anthropoid apes / by Frank E. Beddard.
- Frank Evers Beddard
- Date:
- 1893
Licence: Public Domain Mark
Credit: Contributions to the anatomy of anthropoid apes / by Frank E. Beddard. Source: Wellcome Collection.
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![Affinities of the Genus. The British Museum contains a large number of specimens of this species, and these well show its range. One of the smallest specimens, having a zoarium barely 1 mm. in diameter, is of interest as showing that this genus passes through a Conescharellina (or Bat op or a) stage ; the small central zocecium is surrounded by an irregular series of others having the tumid forms, granular walls, and terminal apertures of that genus. This therefore shows that Conescharellina, and especially such a species as C. clithridiata, is a more primitive form than Orbitulipora with its remarkably specialized zoarium. The species is also clearly distinct from 0. lenticularis, Reuss [No. 11, p. 289, pi. xxx. figs. 12-14], as to the generic position of which I do not feel able to express an opinion from Reuss’s figures. Family SMITTIDiE. Genus Mucronella, Hincks, 1880. Diagnosis. Hincks, No. 2, p. 360. Species 1. Mucronella angusto(ecium, n. sp. Syn. Porella concinna, var. eocena, G. E. Vine, 1891, Proc. Yorks. Geol. & Polyt. Soc. vol. xii. p. 61. Diagnosis. Zoarium: unilaminar flat surfaces (1 erect or encrusting algae). Zocecia irregular, but with a tendency towards a disposition along radial branching lines. Shape approximately hexagonal. The zocecia are tumid, rising from a flat surface. Orifice suborbicular : the peristome is high and thickened, especially on the lower margin; it here bears a small simple mucro. The thick bases of a pair of marginal spines occur on the lower angles of the orifice. The thick lower lip has a distinct median transverse depression. Surface granular. Zooecia separated. About a dozen areolse occur around the lower half of the zocecia. Ocecia numerous, granular, globose, but narrow. In one case there are two ocecia to one zooecium. Avicularia: none. Distribution. Barton Beds, Barton ; London Clay, Fareham. Type. Brit. Mus. No. 49739. Edwards Coll. From Barton. Figures. PI. XXXI. fig. 15. Barton Beds. Brit. Mus. No. 49739. Fig. 16. Part of a zoarium from the London Clay, Fareham. Affinities. This species reminds one at first sight of the common recent Mucronella ventricosa (Hass.), and it clearly belongs to the same group ; it differs from that species, however, by the small simple mucro, the narrow instead of elongate ooecia, the position of the marginal spines, and in less important points. Probably its nearest ally is M. hornesi (Reuss) \ of the Middle Oligocene; the new species, however, may be distinguished by its low instead of elongate ocecia. In this character it most resembles 1 Lepralia hornesi, Reuss, No. 8, pp. 633, 634, pi. xiii. fig. 5, and No. 7, pp. 173, 174, pi. vii. fig. 12.](https://iiif.wellcomecollection.org/image/b28141386_0102.jp2/full/800%2C/0/default.jpg)
